JPH04122486A - Waste melting furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present application relates to a waste melting furnace used for melting waste, and more specifically, a furnace body is provided with a coke-filled bed,
The present invention relates to a waste melting furnace in which the lower region of the coke packed bed is formed as a high-temperature hearth, and a slag discharge port is provided at the bottom portion of the furnace body.

[Conventional technology]

Conventionally, such waste melting furnaces form a coke-filled bed in the lower part of the vertical furnace body, and waste is fed into the upper part of this coke-filled bed, and the waste is burned and ashed in this part. Or it could be processed by turning it into slag.

Here, the slag-formed incombustibles were discharged from a slag discharge port connected to the bottom of the coke packed bed.

[Invention or problem to be solved]

However, in recent years, waste melting furnaces have been used for
There are cases where it is necessary to treat hazardous wastes such as EP dust, car shredder dust, and PCBs containing low-boiling point metals such as Zn, Cd, and Hg. In such a case, in a conventional waste melting furnace, the waste is heated, gasified, and melted at the top of the coke packed bed, so that dust 1 is generated in this area and is also heated by the exhaust gas. Since harmful dust floats in the exhaust passage provided at the top of the furnace, harmful dust has been removed and treated by installing a special removal device in the exhaust passage. However, such a removal device is large-scale and expensive.

Furthermore, since the waste mentioned above contains combustible materials, and most of these combustible materials are gasified, the amount of heat generated by the combustion of this generated gas is It is sent to the upper part of the furnace together with the gas and simply sent out from the exhaust passage. Therefore, this amount of heat does not contribute sufficiently to the melting of non-combustible materials, is simply disposed of externally through the exhaust passage, and is not effectively utilized within the melting furnace.

Therefore, the purpose of this application is to effectively use the heat of combustibles in waste, which has not been effectively used for melting non-combustible materials, to raise the temperature of waste and melt ash, and to Burns combustibles in good condition and eliminates harmful EP
It is an object of the present invention to provide a waste melting furnace that can raise the temperature of dust, make it harmless, and prevent the dust from scattering or being mixed into the exhaust gas.

[Means to try to solve the problem]

In order to achieve this objective, the waste melting furnace according to the present invention has a characteristic configuration: a combustion chamber is provided which communicates with the coke packed bed above the slag discharge port and below the top surface of the coke packed bed; The present invention includes a first supply device that supplies solid waste to the combustion chamber and a second supply device that supplies combustible fluid waste, and the functions and effects thereof are as follows.

[For production]

In other words, in the waste melting furnace of the present application, solid waste is supplied from the first supply device, or fluid waste such as combustible powder or liquid is supplied from the second supply device in connection with the coke packed bed. It is supplied to a combustion chamber where it undergoes combustion and melting treatment. This combustion chamber opens into a coke-filled bed, and the combustion gases produced in this combustion chamber are exhausted through the coke-filled bed. Further, the slag produced in this combustion chamber similarly passes through a coke packed bed and is discharged from a slag discharge port provided on the bottom side of this combustion chamber.

〔Effect of the invention〕

As a result, the above-mentioned harmful dust contained in the waste will also pass through the coke packed bed along with the combustion gas as the treatment progresses, or will this coke packed bed act as a filter? This allows harmful dust to be collected. Further, since the gas generated by the combustion of waste is also converted into combustible gas by passing through the coke packed bed, the calorific value of this gas contributes to raising and retaining the temperature of the high-temperature coke hearth. In other words, since the heat capacity of the waste is effectively utilized, the consumption of coke, which is an auxiliary fuel, can be reduced. Additionally, solid waste and fluid waste are fed into the combustion chamber separately;
The charging operation is easy, and the fluid can be mixed well with air, resulting in good combustion and a more ideal combustion state. Therefore, it is necessary to treat solids and fluids at the same time, and even when treating waste such as EP dust that contains harmful substances, it is necessary to effectively and safely detoxify incombustible substances in the waste by melting it. It has now become possible to reduce and stabilize the amount and process it.

〔Example〕

Embodiments of the present application will be described based on the drawings. In Figure 1,
A longitudinal section through the waste melting furnace (1) of the present application is shown.

The waste melting furnace (1) of the present application has a roughly letter-shaped furnace body (2), and the horizontal furnace part (2) on the bottom side that communicates with each other (
3) and a vertical cylindrical furnace part (4). The devices connected to the respective furnace sections (3) and (4) will be explained below. First, a coke supply device (5) such as a popper is installed in the upper part of the vertical furnace part (4), and an exhaust passage (7) for exhaust gas is installed on the side of this upper part (6). A communicating opening is provided. Furthermore, there is a slag discharge port (8) near the bottom of this vertical furnace part (4).
An air nozzle (9) for supplying air (g) for coke combustion is provided above the slag discharge port (8). The bottom surface (10) of the horizontal furnace section (3) is inclined toward the slab discharge port (8) described above. The configuration of the horizontal furnace section (3) will be explained below. This horizontal furnace part (3) is connected to the lower area of the vertical furnace part (4) mentioned above, and there is a part (11) that protrudes laterally from this vertical furnace part (4).
In this application, it is configured as a combustion chamber (12).

This combustion chamber (12) is equipped with a first supply device (13) for supplying solid waste and a second supply device (I4) for supplying combustible and fluid waste in powder or liquid form. ing. Then, the combustion chamber (12) is supplied from the second supply device (14).
), a configuration is adopted in which air for combustion is supplied together with the above-mentioned fluid waste. In addition, this combustion chamber (12
) is equipped with an ignition burner (15) for ignition. In addition, a heat recovery system (
16), HCI removal equipment (17), desulfurization equipment (18)
They are installed in order.

The usage conditions of this waste melting furnace (1) will be explained below.

In use, coke (C) is first introduced from the coke feeder (5) above the upper end (12T) of the combustion chamber (12) in the side furnace (3) as shown in the figure. In this charged state, coke (C
) or as shown in the figure, rest with a certain amount of combustion space (S) left. Solid waste and combustible fluid waste are charged into this combustion space (S) from the first and second supply devices (13) and (14), respectively. Then, it is ignited and combusted by the aforementioned ignition bar (15) provided in this combustion space (S). Here, the temperature of this combustion space (S) ranges from 1500 degrees C to 16
00 degrees Celsius is reached and the solid waste is melted. Also,
A part of the coke is charred, and if the melting cannot be completed, it is completely melted by the combustion heat of the coke in the high temperature hearth (I9) formed at the lower part of the coke hearth. Here, the combustion waste gas (20) generated in the combustion chamber (12) is guided from the combustion chamber (12) to the vertical furnace section (4) and passes through the coke packed bed (21). At this time, the CO2 of the combustion waste gas (20) is removed from the coke-filled bed (
21) becomes a combustible gas as C0C○2 → 2CO. Further, since the dust and the like contained in the exhaust gas including this combustion waste gas (20) are adsorbed by the coke packed bed (21), the amount of gas l- in the melting furnace exhaust gas can be reduced.

[Another Example] In the above-mentioned example, an example was shown in which the fluid waste was supplied together with combustion air from the second supply device (I4) almost at right angles to the combustion chamber. Alternatively, as shown in FIG. 2, a swirling flow may be generated within the combustion chamber (12). In this case, since the air and combustible fluid waste are mixed well in the combustion chamber (12), combustion can be performed more efficiently.

In addition, if you want to recover fuel gas using this waste melting furnace (1), you need to adjust the amount of air supplied from the second supply device (14) and air nozzle (9). It is possible to recover fuel gas by

Incidentally, although reference numerals are written in the claims section for convenience of reference to the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

1 and 2 show an embodiment of the waste melting furnace according to the present invention, FIG. 1 is a vertical sectional view of the waste melting furnace, and FIG. 2 is a second It is a figure showing arrangement composition of a supply device. (1)...Waste melting furnace, (2)...Furnace body, (8)...Slag discharge port, (12)...
... Combustion chamber, (I3) ... First supply device, (14
)...second supply device, (19)...high temperature hearth, (21)...coke packed bed.

Claims (1)

[Scope of Claims] A coke-filled bed (21) is provided in the furnace body (2), and a lower region of the coke-filled bed (21) is formed as a high-temperature hearth (19). A waste melting furnace (1) equipped with a slag discharge port (8) at a bottom portion of the furnace, wherein the furnace is located above the slag discharge port (8) and below the top surface of the coke packed bed (21). A first supply device (1) that is provided with a combustion chamber (12) communicating with the coke packed bed (21) and supplies solid waste to the combustion chamber (12).
13) and a second feeding device (14) for feeding combustible fluid waste.